Bolt-locking device



G. LARSON,

BOLT LOCKING DEVIC APPLICATION FILED FEB. 11

Patented Apr. 25, 1922.

u mrEl Df sta @E eUs'LARson, F n'Ew oRK, v,- Y., ASSIGNQR-TO HARRY Hoes, or new oRK NQ eoLr-rocKmG nnyioii. f

To all whom it may concern: v

Be it known that Gus LARSON SL1bj GClJ of Sweden, residing at 'New York city, New York, has invented new and useful Improve ments in Bolt-Locking Devices, of which the following is afspecifi cation. f i I My invention relates'to mprovements in bolt locking devicesand'has rferencemo're bed, to"arrestf rotary movement gof the.

particularly: to that-- type wherein: .a metal interposedbetween, the 'he'ad' jo'fj boltland its in -eitheridirection,

thelugs ononefsurfa'ce oftlie washer. were vnecessarilydepressible', so that the nutniight turn about the stem ofgthe bolt; vwhen"'the ordin'aryjilock washer between the;"nut

prevent theaters' emgmrning; aiaeagae being turned. A 'wren'ch"maybe employed j of two operators, especiallyif "the? stem of the bolt is of considerablelength.

To overcome the above objections, the present invention contemplates the provision of a flat dish-preferably constructed of metal, having a central opening to receive the stem of a'bolt. Projecting from vopposite surfaces of the disk are lugs sufliciently rigid to remain immovable even when, subjected;

to very great straing This locking device is slmple in construction and has the advantage of being applicable to any of the common types of bolts having polygonal heads. A,

disk of this'kind may be used either against a bed ofwood or of metal. case, the projection or tooth on the under side of the disk would be sufficiently sharp to enable it to bite into the adjacent metal'surface p The invention consists in the features hereinafter fully described with reference to ri e as a side a timeterviewot emf disk. d P v dedh i y'f $P d g 13V ,c v

except? that, a hexagonal he gagecl by the locking diski I xplanefof the" dis c 's'u'r'face to befengaged 'by' one of" the fan I of {the bolt head 10?, I As 5 "shown in, Fig and- 33am lug "is loc'ated insuch a 'pos'ition" 10. Projecting from'th'e under surface of teeth are to take against a comparatively In the latter J/Specification of Letters Patent. yi-Paitgflfed Ap g 1922:."d 1d,: Application filed February 17,1921; serial Nol 44588 3f 3 I I. i

7 view: hr gh a bed hriving'a'fboltf-eatedt5 therein and taken'on the lines 1 .1" of Fig vice.

f}; we, en ged by;i h e i si e pecti ef'wi i'ewfofthe a a-g [1 Devices fof this general character have. i i been heretofore proposed but f infthese 'de 'vicesiin order :to permit the nut to-function heed. fj la* q tfhavin th usu ah stem511and1n'ut-12; baseionb'ec meta ridipr ov" eld with' n 0 receive the ste nut is tightened on loosened, Sufclia eonstructioir locks the'n'ut-againstrmovei'iientbut. f does 1 not"- prevent; the" bolt, mm; rotating 1 whilethe' nut is being tightened or 'lojosene'd V thereon; in: other womety the use o'fj'the' the :bed libldingthe'.boltjit "is sible" The 'wall?-1 7 i presents upon th'e di sk *isaswte rece'ive square headed bolt, while in-Fig. 5 the position of the lug 17 is such that it engages one'ofthe walls or facets of the hexagonal boltrhead the disk" 15 is a radially disposed triangular tooth 18. .The tooth-18,isinclined outwardly and in adirection parallel to the lug 17 H which is diametrically opposite to' the tooth 18.'-

Y It will beunderstood that more than one tooth 18 {may be: provided, especially if the hard surface *In' that case the teeth-18 would necessarily be shorter than the single tooth and treated to give them suificient hardness to enable their oints to biteointo 5 the bed 18.- It-is desirab e to rovidela flat washer 19 at the opposite end of: the bolt, between the bed 13 and the nut 12. I In arrangingfthe' locking disk 15 in its proper position for use, the disk is first v passed over the stem 11 of the bolt. The surface having the lug 17 is passed into engagement with the under face of the head 10 of the bolt. The stem 11 is then introduced into the, opening 14- in the base or bed 13 and 1 the Washer 19 arranged over the protruding end at the opposite sideofthe bed' 13. The

nut 12 is then placed upon the threaded end of the bolt and screwed down against the Washer 19. It will be apparent that asthe nut 12 is tightened the head 10 of the bolt will be drawn against the locking disk 15 compelling the latter to move'against the opposing surface of the bed 13 andforcing the tooth 18 to bite into the former.

The natural tendency of the bolt under thiscondition is to rotate with the nut, but

due to the peculiar arrangement ofthelug 17 and tooth 18; one of the corners of: the head 10 of the bolt Will abut against the straight surface 17 of the lug l7 Simultaneously with this inward movement of the disk 15 there Will be a slightarc'uate movement of the latter, which Willveffectively embed the tooth 18 into the base 13; This is dueto the fact that the end of the toot-h 18 is inclined in the direction. of rotation of the nut,'i. eptovvard the left, as indicated by the arrow Fig. 2. Therefore, the point of the tooth 18 willbeforcedbeneaththe surface of the base 18and the displaced'portion of the, base13 will be forced into the 1 Wedge shaped space between the inclined rangement. of the tooth lBQvvhich has surface of thetooth 18 and-the disk 15. The successful operation of. this feature: of my invention is made possible. by the ar Widest portion counter to the jgeneral'ldire'ction of movement of the nut 112-.-

In other 1 devices of this character the teeth have been arranged so that their widest part isconcentrio with the general direction of movement of the nut and due to the yielding character of the projections on the opposite surface of the Washer, adjacent the nut, sufficient purchase is secured by contact With the bed to lock the Washer. lVhere a locking device is used to temporarily arrest movement of a nutit will be understood that the edges'of the projections must be inclined so that they may be pressed backwardly and then spring outwardly to normal position as the corners of the moving nut release them. But in my bolt looking device the bolt head is prevented from moving relative to the disk 15 by the rigidly disposed lug 17 which is in the path of the possiblemovement ofthe corners of the bolt head 10.

I claim j v c A bolt lock comprising a metal disk having a central opening to receive the stem of bolt, a rigid lug projecting from the outer surface of the disk and having a straight inner edge to abut against one of the said faces of a polygonal'bolt head, ivhereby the bolt will be held against turningin either I direction, and an inclined tooth projecting from the inner surfaceof saiddislrand arranged radially and i adapted to be imbedded in the opposed surfaceof abase surround-v ing said bolt, saiditooth beingtapered and extending in a directioncorrespondingsubstantia'l-ly to the general direction. of movement of: a. nut so thatthe tendency of the nut to rotate the bolt \vhen tightened down Will operate to forcethe lug into engage 

